Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6031789 | Magnetic drive subassembly in a depth control device | Alan Sprain, Louis W. Erath | 2000-02-29 |
| 5949214 | Rechargeable battery pack | Alan Sprain | 1999-09-07 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6031789 | Magnetic drive subassembly in a depth control device | Alan Sprain, Louis W. Erath | 2000-02-29 |
| 5949214 | Rechargeable battery pack | Alan Sprain | 1999-09-07 |